Dietzgen Alidade Surveying Telescope

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Very Unusual, US Dietzgen Alidade Surveying telescope, the primary mapping instrument in the US from about 1865 to the 1980's; used to fill in the detail on a map.  Very good condition considering the age, model no 6230, serial 40750, brass, all dials and screws working, no rust.  Details can be found in the technical manual TM 5-6300-1.  Length 11.5" (29cm) width 3.5" ( 9cm). stock #2308


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